Scientists have developed several theories about how emotions are generated based on subjective feelings, physiological responses, and expressive behavior.
The facial muscles involved in emotional expression are governed by nerves following a complex system of direct and indirect pathways to and from the motor cortex (voluntary smile circuit under conscious control) and the limbic system and brain stem (spontaneous smile circuit not under conscious control). This may explain why people's faces can express emotions like happiness, fear, and disgust without their being aware of it.
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